<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="counter">
        
    </div>

    <script src="test.js"></script>

    <script>
        let counter = document.getElementById('counter')
        new Counter().mount(counter)

    </script>
</body>
</html>